Bring codebase into compliance with bible contracts (A–E)

A (hardware-ingest-json v2.8-2.9): remove sensor location fields from schema
and collector; tag HardwareMemory.Location as json:"-"; add PlatformConfig to
HardwareSnapshot.

B (no-hardcoded-vendors): consolidate PCI vendor IDs into collector/pci_vendors.go;
replace all vendor-name string checks in isGPUDevice, isNVIDIADevice, isMellanoxDevice,
isAMDGPUDevice, matchesGPUVendor (sat_overlay), and validateIsVendorGPU (page_validate)
with numeric vendor_id comparisons.

C (module-structure): split app/app.go (1413 lines) into app.go + app_format.go,
app_network.go, app_services.go, app_packs.go, app_install.go — no logic changes.

D (go-code-style): wrap bare return err in interfaceAdminState and
interfaceIPv4Addrs (platform/network.go) with fmt.Errorf context including
the interface name.

E (go-project-bible): add bible-local/architecture/data-model.md and
bible-local/architecture/api-surface.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/collector/nic_mellanox.go

@@ -11,7 +11,6 @@ import (
 	"time"
 )
 
-const mellanoxVendorID = 0x15b3
 const nicProbeTimeout = 2 * time.Second
 
 var (
@@ -80,16 +79,7 @@ func enrichPCIeWithMellanox(devs []schema.HardwarePCIeDevice) []schema.HardwareP
 }
 
 func isMellanoxDevice(dev schema.HardwarePCIeDevice) bool {
-	if dev.VendorID != nil && *dev.VendorID == mellanoxVendorID {
-		return true
-	}
-	if dev.Manufacturer != nil {
-		m := strings.ToLower(*dev.Manufacturer)
-		if strings.Contains(m, "mellanox") || strings.Contains(m, "nvidia networking") {
-			return true
-		}
-	}
-	return false
+	return dev.VendorID != nil && *dev.VendorID == MellanoxVendorID
 }
 
 func queryMellanoxFromMstflint(bdf string) (firmware, serial string) {